A pressure canner is a specialized kitchen appliance used for preserving low-acid foods, such as vegetables, meats, and poultry. It operates by sealing food in jars and using high pressure and temperature to kill harmful bacteria, ensuring safe preservation. This method is essential for preventing foodborne illnesses, as it reaches temperatures above boiling point. Unlike regular water bath canning, which is suitable for high-acid foods like fruits and jams, pressure canning is necessary for low-acid foods to achieve proper sterilization. Proper use of a pressure canner can extend the shelf life of preserved foods while maintaining their flavor and nutritional value.